Physics – Plasma Physics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981plap.rept..379c&link_type=abstract
In ESA Plasma Astrophys. p 379-381 (SEE N82-20030 10-88)
Physics
Plasma Physics
Auroral Zones, Conical Flow, Electron Beams, Energetic Particles, Ion Distribution, Particle Acceleration, Plasma Physics, Earth Ionosphere, Electrostatic Waves, Propagation Modes, Transverse Acceleration
Scientific paper
It is argued that broadband lower hybrid waves generated by energetic electron beams can be quite efficient in accelerating ions of ionospheric origin (H+ and O+). Throughout the lower altitudes of the suprauroral region, satellite measurements detected plasma waves dominated by broadband lower hybrid modes. How ions of ionospheric origin can be energized perpendicularly to the geomagnetic field lines by resonant interactions with these modes is shown. The added influence of the Earth's magnetic field geometry can lead the energized portion of the ions to evolve into conic distributions. The calculated pitch angles of the ions cluster around 90 to 140 deg. Pitch angles 90 deg can also occur, since the ions can drift towards the ionosphere initially.
Chang Tsao
Coppi Bruno
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